Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
  • B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
  • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D1/00—Flotation
  • B03D1/14—Flotation machines
  • B03D1/24—Pneumatic
  • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S261/00—Gas and liquid contact apparatus
  • Y10S261/75—Flowing liquid aspirates gas

Definitions

• the invention relates to a device for aerating liquids, in particular for flotation, designed as a ring injector, in the of which
• Liquid flowing through the housing is arranged a central piece, which forms an annular channel with the housing, the annular channel having its smallest cross-section at the level of the air outlet openings in the housing wall and in
• Liquid flow direction following the ring channel constriction an abrupt cross-sectional enlargement of the ring channel is made before, to which the mixing and dispersing section adjoins the housing outlet.
• Devices of this type are known and are u.a. used in flotation to separate the solids contained in a slurry.
• the poorly wettable solid particles accumulate on air bubbles that are generated in such devices, also called fumigators, injectors or reactors.
• the solids attached to the air bubbles are generally discharged over the edge of the separation or flotation vessel.
• the aim is to keep the size of the air bubbles as small as possible, because this will facilitate the attachment of solid particles during flotation.
• Air is supplied to the ring injector via air supply channels in the mixing section.
• the annular gap that forms in the ring injector is thereby ventilated inside and outside.
• the mixing section and the center piece, which is located centrally within the mixing and train section, are stepped, whereby the air is sucked into the inside and outside of the dispersion jet that forms, similar to a water jet pump.
• the object of the invention is to improve devices of the prior art in such a way that the specific energy consumption is reduced and the degree of selectivity is increased.
• This device is said to be particularly suitable for the flotation of coal and other processing materials.
• the ventilation device according to the preamble of the main claim has a gap width when the slurry enters the ventilation space, which leads to a minimum clouding speed V 1 of 2.0 m / s.
• the center piece of the device extends to the housing outlet and the diameter is constant.
• the annular channel has the same cross-section from the sudden expansion to the housing outlet and the length of the mixing and Dispersion distance is more than 20 times the annular gap width of the ring channel.
• distribution cones of different diameters of the base of the straight circular cone and / or cones with different angles between the base and the side line of the circular cone i.e. be used with an increased or reduced slope.
• the turbidity distribution can be influenced with the angle of the slope of the cone.
• the strips arranged on the middle piece and / or in the upper part of the housing serve to center the middle piece within the mixing and Dispersion line.
• Such strips can also be designed helically, and it has been shown that a swirl flow is superimposed on the axial flow of the cloudy-air mixture, which has an advantageous effect on the attachment of the solid particles to the air bubbles.
• the centering part can be centered by arranging, for example, centering pins which hold the middle part in the upper housing part.
• Table 1 shows the test conditions and test results which were achieved with ring injectors according to the invention of types 1 to 3. In the flotation tests on a semi-industrial scale, flotation sludge from a hard coal wash was used as the feed.
• the ventilation device shown in the cross-sectional view consists of a multi-part housing.
• the lower housing part (3) has a connecting flange (1) to which the slurry pipe (not shown) is connected.
• the arrow indicates the direction of flow of the slurry.
• the inlet diameter of the ventilation device is denoted by (0).
• a housing section adjoins the lower housing part (3), in which the air chamber (4) is located with the ring-shaped air outlet opening.
• the ventilation medium flows to the air chamber (4) via an air line (not shown).
• the gap width of the air outlet openings in the annular gap of the air chamber (4) can be changed by interposing spacer rings (13).
• the upper housing part (7) is arranged above the lower housing part (3) with air chamber (4).
• the flange (5) is used to attach the ventilation device within a line to the (not shown) separation vessel or when the
• Ventilation device outside the separation vessel as a line connection to the separation vessel.
• the core which consists of a distribution cone (2) and the center piece (10), is located within the housing of the ventilation device. Distribution cone and center piece can be screwed or plugged together. The The separation point is located at the transition from the reduction of the cross-section of the distribution cone to the central part of the same diameter.
• the center piece (10) has a constant diameter over its entire length up to the housing outlet (12).
• the mixing and dispersing section (6) with a length L 1 and a constant gap width (Q 3 ) connects to the housing outlet (12).
• a screw-shaped bar (8) is indicated on the middle piece (10) and is intended to center the middle piece in the upper housing part (7) and to generate a swirl flow of the cloudy-air mixture.
• a holding device (9) in the form of an adjustable pin is located on the upper housing part (7) below the housing outlet (12).

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biotechnology (AREA)
• Physical Water Treatments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6314763

Family Applications (1)

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Cited By (4)

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Citations (7)

Family Cites Families (6)

• 1986
  • 1986-11-26 DE DE19863640315 patent/DE3640315A1/de active Granted
• 1987
  • 1987-11-04 EP EP87116227A patent/EP0269897A1/de active Pending
  • 1987-11-04 EP EP87907753A patent/EP0290550A1/de not_active Withdrawn
  • 1987-11-04 WO PCT/EP1987/000665 patent/WO1988003838A1/de not_active Application Discontinuation
  • 1987-11-04 AU AU82779/87A patent/AU8277987A/en not_active Abandoned
  • 1987-11-04 US US07/238,352 patent/US4840753A/en not_active Expired - Fee Related
  • 1987-11-25 ZA ZA878853A patent/ZA878853B/xx unknown

Patent Citations (7)

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